I decided to just go ahead and build a real sub on a small footprint rather than trying to make up for the poor low end on my satellite speakers. I'm thinking about a Dayton RSS210HF in a 1.2 cu ft box with 2 ports (I ran the numbers on WinISD)
Can I go with the Dayton 70 watt amp? The room is smallish and I'll never want to crank it. I just want it to make music.

PS: I'm thinking about making it a down firing sub. Also adding 10lbs of lead to the cabinet in order to allow it to semi function as an end table....